From patchwork Fri Nov 8 15:52:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Matthieu Baerts \(NGI0\)" X-Patchwork-Id: 841838 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B919821B436; Fri, 8 Nov 2024 15:53:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731081188; cv=none; b=FkdDVFLMv0/fgspzBEHZP2xbVKOjxMJiuBulkc6XEBSYy6JOWfKZ5b/dvyXsJ4I7l3BngD+J8QxMkZkN+0rjyX9ADvsf4m09A6P4v77chU7RXWx9Ct5QF4xn+HFUkQ2pv3ykY+j0K5b94MAON7VhVRMeFqTz5XV33JtqbGX526U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731081188; c=relaxed/simple; bh=W0Effr/onGCmHz7sYncRbxQN685XfrSEMY/y4+G3jgs=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=klMKXcsXsaY4UyfuPmlcd02L5XZrsAjDvQnErW8MqTEtqULxxga/XPRLql8mLwWOWwoXJ2e7hepk/Tt+/Wvpf2s7JTB0A+Z1x8lM6r47ORHFWRlOWyWxt0SGwIA1axP1iSrfYX9ZKzsg8RUCXVFg1VA4fjKKV0jlC35Mb9Andic= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=i8vUe+RV; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="i8vUe+RV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 27DD9C4CECD; Fri, 8 Nov 2024 15:53:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1731081188; bh=W0Effr/onGCmHz7sYncRbxQN685XfrSEMY/y4+G3jgs=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=i8vUe+RVl8IsE8H+aGI55gjOHVCBFnMOLrhwJytBeH9djaAhyKRSgFoRdiDXs6Cfc a8UEJ4x4X9NEBs6Q9nsmaA/kzIgdxVdOc6sOVpufVqJBH610EeyEthztb3WA8JME6S BjB7Nry8t+/Bu7To81T8qZpsNZZDSizx2/4t0zJBd7YSMzMhHtjR9KsFEDNaoA/huM 8vFGNenT92ydEMh004mQBoh7fXmOlVnsW71osyEb2Q0F+2yfQgfpsTmEzmdkcCVSVc JYUpm7Qpg8MY0NnBH1yYIGIKIR2mvubXK6IdrzhiXZNopcdA0+q/H1oTAQ1bAytrV6 3SBGrbU1bqj2A== From: "Matthieu Baerts (NGI0)" Date: Fri, 08 Nov 2024 16:52:34 +0100 Subject: [PATCH bpf-next/net 5/5] selftests/bpf: Add mptcp_subflow bpf_iter subtest Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241108-bpf-next-net-mptcp-bpf_iter-subflows-v1-5-cf16953035c1@kernel.org> References: <20241108-bpf-next-net-mptcp-bpf_iter-subflows-v1-0-cf16953035c1@kernel.org> In-Reply-To: <20241108-bpf-next-net-mptcp-bpf_iter-subflows-v1-0-cf16953035c1@kernel.org> To: mptcp@lists.linux.dev, Mat Martineau , Geliang Tang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Mykola Lysenko , Shuah Khan Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, "Matthieu Baerts (NGI0)" , Geliang Tang X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=9072; i=matttbe@kernel.org; h=from:subject:message-id; bh=mok1cxbzysrOdoG47edT0d+OIHVvidumZlEd95OpRYQ=; b=owEBbQKS/ZANAwAIAfa3gk9CaaBzAcsmYgBnLjPBcDrOQ9elK2yafy+lKt/sxbGgIBGgBlkvw LCmWeYF8o6JAjMEAAEIAB0WIQToy4X3aHcFem4n93r2t4JPQmmgcwUCZy4zwQAKCRD2t4JPQmmg cyLhD/9oP7JFm0HjLF8v4CXvtEwGtwj+DbN6rwHJSHlbPc35ihBpcb4nzden0Y4dd+DfQjiIKRS e8IRxgw8MEGfY7QvZhnWkLazyqa4UpnFJY0j9pEQ7NKsGQ2ejvTN3ZzpFhFFuIDbXeRwWBsE3Li qe/8x9XUv6vz876Oyu0uYf09quy/cBpapjX5LhX6hv/TrELN906wDvg9jAde2oz0K/SNL5WqfAV RbSNahuyMtpvjObxbp97n0jW7MlPvrhPZJMcfvVFycKX2hyStOVBhlzh1ymG9gDCDS2RlLOY0mB 8adrbwe0rkkIydR0H6d9YGu9/LxmRg68i+lK0s5fhZSw68eEKH8dOCAyQeVWbKhYmtiBc+pmUSl 1DFoTvUUABsRv5qDR7ph/kfBZMijTHpnebeJAQkgnW7QwYF/PHDRFQHzNcMfvDm8s2HGk3wRhe1 xxw3/iHsGYH4pfjex2faZDOkTijk0mbNy0ZGrdwVikktEewV0YcKfupGbSFnyW+3wyWxk5dyZpq kYwzA8TNGhI/UGZeZ0uVcZnddGWZ0WptlKUxEAzVFtf4YM+UhMHkmjB00tzoHgbwo0QQw8f42CC XovP4HDz5aOH9K6d41YZbmqFeo/FCQstT1Yd+DUAlfLwzbPUvGPno6Ho3cn8jPVBhQes7j37JD2 nehkWKoeQXNGpXg== X-Developer-Key: i=matttbe@kernel.org; a=openpgp; fpr=E8CB85F76877057A6E27F77AF6B7824F4269A073 From: Geliang Tang This patch adds a "cgroup/getsockopt" program "iters_subflow" to test the newly added mptcp_subflow bpf_iter. Export mptcp_subflow helpers bpf_iter_mptcp_subflow_new/_next/_destroy, bpf_mptcp_sock_acquire/_release and other helpers into bpf_experimental.h. Use bpf_mptcp_sock_acquire() to acquire the msk, then use bpf_for_each() to walk the subflow list of this msk. From there, future MPTCP-specific kfunc can be called in the loop. Because they are not there yet, this test doesn't do anything very useful for the moment, but it focuses on validating the 'bpf_iter' part and the basic MPTCP kfunc. That's why it simply adds all subflow ids to local variable local_ids to make sure all subflows have been seen, then invoke the kfunc bpf_mptcp_subflow_tcp_sock() in the loop to pick a subsocket. Out of the loop, use bpf_mptcp_subflow_ctx() to get the subflow context of the picked subsocket and do some verifications. Finally, assign local_ids to global variable ids so that the application can obtain this value, and release the msk. A related subtest called test_iters_subflow is added to load and verify the newly added mptcp_subflow type bpf_iter example in test_mptcp. The endpoint_init() helper is used to add 3 new subflow endpoints. Then one byte of message is sent to trigger the creation of new subflows. getsockopt() is invoked once the subflows have been created to trigger the "cgroup/getsockopt" test program "iters_subflow". skel->bss->ids is then checked to make sure it equals 10, the sum of each subflow ID: we should have 4 subflows: 1 + 2 + 3 + 4 = 10. If that's the case, the bpf_iter loop did the job as expected. Signed-off-by: Geliang Tang Reviewed-by: Matthieu Baerts (NGI0) Signed-off-by: Matthieu Baerts (NGI0) --- tools/testing/selftests/bpf/bpf_experimental.h | 8 +++ tools/testing/selftests/bpf/prog_tests/mptcp.c | 73 ++++++++++++++++++++++ tools/testing/selftests/bpf/progs/mptcp_bpf.h | 10 +++ .../testing/selftests/bpf/progs/mptcp_bpf_iters.c | 64 +++++++++++++++++++ 4 files changed, 155 insertions(+) diff --git a/tools/testing/selftests/bpf/bpf_experimental.h b/tools/testing/selftests/bpf/bpf_experimental.h index b0668f29f7b394eb5294b6c9cade28fc1b17265a..08eaa431aafd758117f8e818410c4a3e7fd0b70c 100644 --- a/tools/testing/selftests/bpf/bpf_experimental.h +++ b/tools/testing/selftests/bpf/bpf_experimental.h @@ -575,6 +575,14 @@ extern int bpf_iter_css_new(struct bpf_iter_css *it, extern struct cgroup_subsys_state *bpf_iter_css_next(struct bpf_iter_css *it) __weak __ksym; extern void bpf_iter_css_destroy(struct bpf_iter_css *it) __weak __ksym; +struct bpf_iter_mptcp_subflow; +extern int bpf_iter_mptcp_subflow_new(struct bpf_iter_mptcp_subflow *it, + struct mptcp_sock *msk) __weak __ksym; +extern struct mptcp_subflow_context * +bpf_iter_mptcp_subflow_next(struct bpf_iter_mptcp_subflow *it) __weak __ksym; +extern void +bpf_iter_mptcp_subflow_destroy(struct bpf_iter_mptcp_subflow *it) __weak __ksym; + extern int bpf_wq_init(struct bpf_wq *wq, void *p__map, unsigned int flags) __weak __ksym; extern int bpf_wq_start(struct bpf_wq *wq, unsigned int flags) __weak __ksym; extern int bpf_wq_set_callback_impl(struct bpf_wq *wq, diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c index 85f3d4119802a85c86cde7b74a0b857252bad8b8..f37574b5ef68d8f32f8002df317869dfdf1d4b2d 100644 --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c @@ -11,6 +11,7 @@ #include "mptcp_sock.skel.h" #include "mptcpify.skel.h" #include "mptcp_subflow.skel.h" +#include "mptcp_bpf_iters.skel.h" #define NS_TEST "mptcp_ns" #define ADDR_1 "10.0.1.1" @@ -33,6 +34,9 @@ #ifndef MPTCP_INFO #define MPTCP_INFO 1 #endif +#ifndef TCP_IS_MPTCP +#define TCP_IS_MPTCP 43 /* Is MPTCP being used? */ +#endif #ifndef MPTCP_INFO_FLAG_FALLBACK #define MPTCP_INFO_FLAG_FALLBACK _BITUL(0) #endif @@ -480,6 +484,73 @@ static void test_subflow(void) close(cgroup_fd); } +static void run_iters_subflow(void) +{ + int server_fd, client_fd; + int is_mptcp, err; + socklen_t len; + + server_fd = start_mptcp_server(AF_INET, ADDR_1, PORT_1, 0); + if (!ASSERT_OK_FD(server_fd, "start_mptcp_server")) + return; + + client_fd = connect_to_fd(server_fd, 0); + if (!ASSERT_OK_FD(client_fd, "connect_to_fd")) + goto close_server; + + send_byte(client_fd); + wait_for_new_subflows(client_fd); + + len = sizeof(is_mptcp); + /* mainly to trigger the BPF program */ + err = getsockopt(client_fd, SOL_TCP, TCP_IS_MPTCP, &is_mptcp, &len); + if (ASSERT_OK(err, "getsockopt(client_fd, TCP_IS_MPTCP)")) + ASSERT_EQ(is_mptcp, 1, "is_mptcp"); + + close(client_fd); +close_server: + close(server_fd); +} + +static void test_iters_subflow(void) +{ + struct mptcp_bpf_iters *skel; + struct netns_obj *netns; + int cgroup_fd; + + cgroup_fd = test__join_cgroup("/iters_subflow"); + if (!ASSERT_OK_FD(cgroup_fd, "join_cgroup: iters_subflow")) + return; + + skel = mptcp_bpf_iters__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel_open_load: iters_subflow")) + goto close_cgroup; + + skel->links.iters_subflow = bpf_program__attach_cgroup(skel->progs.iters_subflow, + cgroup_fd); + if (!ASSERT_OK_PTR(skel->links.iters_subflow, "attach getsockopt")) + goto skel_destroy; + + netns = netns_new(NS_TEST, true); + if (!ASSERT_OK_PTR(netns, "netns_new: iters_subflow")) + goto skel_destroy; + + if (endpoint_init("subflow", 4) < 0) + goto close_netns; + + run_iters_subflow(); + + /* 1 + 2 + 3 + 4 = 10 */ + ASSERT_EQ(skel->bss->ids, 10, "subflow ids"); + +close_netns: + netns_free(netns); +skel_destroy: + mptcp_bpf_iters__destroy(skel); +close_cgroup: + close(cgroup_fd); +} + void test_mptcp(void) { if (test__start_subtest("base")) @@ -488,4 +559,6 @@ void test_mptcp(void) test_mptcpify(); if (test__start_subtest("subflow")) test_subflow(); + if (test__start_subtest("iters_subflow")) + test_iters_subflow(); } diff --git a/tools/testing/selftests/bpf/progs/mptcp_bpf.h b/tools/testing/selftests/bpf/progs/mptcp_bpf.h index 3b188ccdcc4041acb4f7ed38ae8ddf5a7305466a..3210736b1c349a989c5fb5c16dc21d03d6f9b5bf 100644 --- a/tools/testing/selftests/bpf/progs/mptcp_bpf.h +++ b/tools/testing/selftests/bpf/progs/mptcp_bpf.h @@ -39,4 +39,14 @@ mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) return subflow->tcp_sock; } +/* ksym */ +extern struct mptcp_sock *bpf_mptcp_sock_acquire(struct mptcp_sock *msk) __ksym; +extern void bpf_mptcp_sock_release(struct mptcp_sock *msk) __ksym; + +extern struct mptcp_sock *bpf_mptcp_sk(struct sock *sk) __ksym; +extern struct mptcp_subflow_context * +bpf_mptcp_subflow_ctx(const struct sock *sk) __ksym; +extern struct sock * +bpf_mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) __ksym; + #endif diff --git a/tools/testing/selftests/bpf/progs/mptcp_bpf_iters.c b/tools/testing/selftests/bpf/progs/mptcp_bpf_iters.c new file mode 100644 index 0000000000000000000000000000000000000000..1bede22a7e3d125ec357fb798059e7bbcfe0d227 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/mptcp_bpf_iters.c @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2024, Kylin Software */ + +/* vmlinux.h, bpf_helpers.h and other 'define' */ +#include "bpf_tracing_net.h" +#include "mptcp_bpf.h" + +char _license[] SEC("license") = "GPL"; +int ids; + +#ifndef TCP_IS_MPTCP +#define TCP_IS_MPTCP 43 /* Is MPTCP being used? */ +#endif + +SEC("cgroup/getsockopt") +int iters_subflow(struct bpf_sockopt *ctx) +{ + struct mptcp_subflow_context *subflow; + struct bpf_sock *sk = ctx->sk; + struct sock *ssk = NULL; + struct mptcp_sock *msk; + int local_ids = 0; + + if (!sk || sk->protocol != IPPROTO_MPTCP || + ctx->level != SOL_TCP || ctx->optname != TCP_IS_MPTCP) + return 1; + + msk = bpf_mptcp_sk((struct sock *)sk); + if (msk->pm.server_side || !msk->pm.subflows) + return 1; + + msk = bpf_mptcp_sock_acquire(msk); + if (!msk) + return 1; + bpf_for_each(mptcp_subflow, subflow, msk) { + /* Here MPTCP-specific packet scheduler kfunc can be called: + * this test is not doing anything really useful, only to + * verify the iteration works. + */ + + local_ids += subflow->subflow_id; + + /* only to check the following kfunc works */ + ssk = bpf_mptcp_subflow_tcp_sock(subflow); + } + + if (!ssk) + goto out; + + /* assert: if not OK, something wrong on the kernel side */ + if (ssk->sk_dport != ((struct sock *)msk)->sk_dport) + goto out; + + /* only to check the following kfunc works */ + subflow = bpf_mptcp_subflow_ctx(ssk); + if (subflow->token != msk->token) + goto out; + + ids = local_ids; + +out: + bpf_mptcp_sock_release(msk); + return 1; +}